JPS6127884A - Vibration-proof device for elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Field of Application of Jl! Akira) The present invention relates to a vibration isolation system for an elevator, and in particular to suppressing vibration of a plurality of ropes for lifting and lowering a body. Concerning an advantageous anti-vibration device.

[Background of the invention]

In general, conventional elevators are constructed as shown in Figures 2 and 13: A plurality of ropes 3 are wound around a sheave 2 of a hoisting machine 1 installed in the machine room at the top of the hoistway, and each end of the rope is used to lift and lower the elevator. The body, which is the rider 4, and the counterweight 5 are suspended. The sheave 2 is rotated by the drive motor 6 and reduction gear 7 of the hoist 1, and the elevating body is moved up and down.

By the way, the connections between each lifting body and the rope 3 are actually connected to both ends of the rope 3 and hanging rods 8.9, and a hanging frame body that supports the descending body 4 and the counterweight 5, which are the lifting bodies. 12.43. That is, the hanging rod 8
, 9 are passed through the suspension/frame bodies 12 and 13, and coil springs 10. -11 is fitted and fixed, and the weight of the elevating body is supported by the rope 3 via each spring 10,11. During operation, rotational pulsations caused by the hoist 1 occur, and the rope 3 is vibrated in the up-and-down direction, transmitting vibrations to the seat 4. In particular, when the natural frequency of the rope 3 coincides with the frequency of the rotational pulsation, the riding comfort is significantly reduced. - Therefore, in order to suppress the resonance of the rope, for example, a common leaf spring 14 is attached to the lower ends of the plurality of hanging rods 8 that are elastically suspended through the hanging frame 12, and,
It has been proposed that a weight is attached to the leaf spring 14 so that the natural frequency determined by the mass of the weight and the spring constant of the leaf spring 14 matches the frequency of rotational pulsation.

(Japanese Patent Publication No. 47-51625) However, in this configuration, the vibration of the plurality of lobes 3 is absorbed by the leaf spring 1.
Since a set of devices consisting of 4 and a weight are used to suppress the problem at the same time, the weight must be made heavier, and as a result.

Since the device is large and requires a lot of installation space, it has the disadvantage of poor installation workability. Furthermore, it is extremely difficult to make the plurality of lobes 3 so that their natural frequencies are the same, and therefore it is difficult to simultaneously suppress the resonance of all the ropes using this device.

For this reason, rather than actually applying this device to an elevator to suppress the resonance of the lobe 3.

Means has been adopted to suppress rotational pulsations caused by the hoisting machine 1, which is a source of vibration to the lobe 3, and to prevent resonance of the lobe 3 from occurring. That is, the drive motor 6 of the hoisting machine 1
In the past, an inner pole induction motor with a large number of poles, that is, a low rated rotational speed, was used as an induction motor that was less likely to cause rotational pulsation.

Recently, when trying to use a four-pole induction motor with a high rated rotation speed and a small number of poles as the drive motor 6 due to the demand for smaller size and lighter weight, the rotational pulsation increases due to the high speed rotation and resonance of the lobe 3 is likely to occur. There were problems and technical bottlenecks.

[Purpose of the invention]

The object of the present invention is to use a small elevator prevention device that is easy to install and has an excellent vibration-proofing effect that can individually suppress the resonance of the lobes, so that a four-pole induction motor can be used as a drive motor for a hoisting machine. The purpose is to do so.

[Summary of the invention]

The key point of the present invention is that a weight is supported via an elastic body on each of the plurality of hanging rods on which the elevating body is suspended via an elastic body.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described.

A cylindrical anti-vibration rubber (for example, a loss coefficient of 0605 to 0.3) 16 with a large internal loss is fitted onto the penetrating side of the plurality of hanging rods 8 that pass through the hanging frame 12, and then nuts N are fitted. Screw them in to determine the position of the vibration isolating rubber 16. With this configuration, the hanging frame 12 is suspended by the hanging rod 8 via the vibration isolating rubber 16.

A fine adjustment weight 20 is attached to the lower end of each hanging rod 8. Weight 19. Fit the mounting plate 17 and tighten the nut
position. Then, between the mounting plate 17 and the weight 19, an appropriate internal loss (for example, a loss coefficient of 0.05 to o
, i), the vibration absorbing device 21 is constructed by interposing a plurality of cylindrical vibration isolating rubbers 18 having the following characteristics.

Incidentally, the vibration isolating rubber 16 and the weights 19 and 20 have through holes 16H and 19H through which the hanging rod 8 passes, respectively.

20H is provided to prevent deformation of the preventive rubber 16 due to the load and to prevent the attachment/detachment and movement of the weights 19 and 20 from being obstructed.

Then, the natural frequency determined by the spring constant of the prevention rubber 18 and the mass of the weights 19 and 20 is selected so as to match the frequency of the rotational pulsation.

With this configuration, the lobe resonates due to rotational pulsation of the sheave of the first hoist, and the vibration is transmitted to the hanging rod 8.
Even if the vibration is transmitted to the
The deformation loss suppresses the resonance of the suspension rod 8, that is, the lobe. Incidentally, resonance can be suppressed to a fraction of that of conventional springs (see Figure 3).

Therefore, even if the vibration energy due to the resonance of the weights 19 and 20 is reduced, the vibration of the hanging rod 8 can be suppressed to the same level or more than before, so the weight 19 can be made smaller and lighter, and the vibration isolating rubber 18 can also be made smaller. , and requires less installation space. Also.

Since the natural frequency of the lobe can be selected for each hanging rod 8, the resonance of the lobe can be efficiently suppressed.
It becomes possible to standardize the vibration isolating rubber 18 and the weights 19 and 20.

By the way, in the embodiment, the vibration absorbing device 21 is composed of the vibration isolating rubber 18 and the weights 19 and 20, but the same effect can be obtained by using a metal leaf spring or coil spring instead of the vibration isolating rubber 18. It will be done.

Further, the present invention can be applied not only to the resonance of the lobe on the car side, but also to the case of suppressing the resonance of the lobe on the counterweight side.

〔Effect of the invention〕

According to the present invention, resonance of multiple lobes can be individually suppressed,
Since most of the resonance of the lobe can be suppressed by the first elastic body, the combination of the second elastic body and the weight can be made smaller and lighter, and accordingly, the installation space for the second elastic body and the weight can be reduced. I'll try it.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating the main parts of an elevator vibration isolator according to the present invention, FIG. 2 is a diagram showing the overall structure of the elevator, and FIG. 3 is a diagram showing the main parts of a conventional elevator vibration isolator. l...Hoisting machine, 2...Sheave, 3...Lobe, 8
... Hanging rod 1, 12 ... Hanging frame body, 16, 18
... Anti-vibration rubber. Mustard l Solid δ 2nd eye Moya 3rd eye

Claims (1)

[Claims] 1. A hoisting machine installed at the top of the hoistway, multiple ropes wound around the sheaves of this hoisting machine, hanging rods connected to the hanging ends of these multiple ropes, and these hanging rods. a hanging frame body suspended from a rod via a first elastic body and guided so as to be movable in upward and downward directions; a weight supported by each of the hanging rods via a second elastic body; A vibration isolating device for an elevator, comprising an elevating body supported by the hanging frame.